<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
     <el-card>
         <!-- 添加角色按钮区域 -->
        <el-row>
           <el-col>
              <el-button type='primary'>添加角色</el-button>
           </el-col>
        </el-row>
        <!-- 角色列表区 -->
        <el-table :data='rolelist' border stripe>
            <!-- 展开列 -->
           <el-table-column type='expand'>
              <template slot-scope="scope">
                 <el-row :class='["bdbottom", i1 === 0 ? "bdtop" : "", "vcenter"]' v-for="(item1, i1) in scope.row.children" :key='item1.id'>
                     <!-- 渲染一级 -->
                    <el-col :span='5'>
                       <el-tag closable @close='removeRightById(scope.row,item1.id)'>{{item1.authName}}</el-tag>
                       <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二三级 -->
                    <el-col :span='19'>
                        <!-- 通过for循环嵌套渲染二级权限 -->
                       <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key='item2.id'>
                          <el-col :span='6'>
                              <el-tag type='success' closable @close='removeRightById(scope.row,item2.id)'>{{item2.authName}}</el-tag>
                              <i class="el-icon-caret-right"></i>
                          </el-col>
                          <el-col :span='18'>
                              <el-tag v-for="(item3) in item2.children" :key='item3.id' type='warning' closable @close='removeRightById(scope.row,item3.id)'>{{item3.authName}}</el-tag>
                          </el-col>
                       </el-row>
                    </el-col>
                 </el-row>
              </template>
           </el-table-column>
           <!-- 索引列 -->
           <el-table-column type='index'></el-table-column>
           <el-table-column label='角色名称' prop='roleName'></el-table-column>
           <el-table-column label='角色描述' prop='roleDesc'></el-table-column>
           <el-table-column label='操作' width='300px'>
              <template slot-scope='scope'>
                 <el-button size='mini' type="primary" icon="el-icon-edit">编辑</el-button>
                 <el-button size='mini' type="danger" icon="el-icon-delete">删除</el-button>
                 <el-button size='mini' type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
              </template>
           </el-table-column>

        </el-table>
     </el-card>
     <!-- 分配权限的对话框 -->
     <el-dialog
        title="分配权限"
       :visible.sync="setRightDialogVisible"
        width="50%" @close='setRightDialogClosed'>
        <!-- 树形控件 -->
       <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key='id' default-expand-all :default-checked-keys='defKeys' ref="treeRef"></el-tree>
       <span slot="footer" class="dialog-footer">
         <el-button @click="setRightDialogVisible = false">取 消</el-button>
         <el-button type="primary" @click="allotRights">确 定</el-button>
       </span>
     </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的id值的数组
      defKeys: [],
      roleId: []
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$messages.error('获取角色列表失败')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据id删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该用户，是否继续？', '提示', {
        confirmButtonText: '确定',
        canceButtonText: '取消',
        type: 'warning'
      }).catch(err => { return err })
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // 把获取到的权限数据保存到data中
      this.rightslist = res.data
      console.log(this.rightslist)
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys数组中
    getLeafKeys (node, arr) {
      // 如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭权限
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
